i2pd/ChangeLog

# for this file format description,
# see https://github.com/olivierlacan/keep-a-changelog

## [2.51.0] - 2024-04-06
### Added
- Non-blocking mode for UDP sockets
- Set SSU2 socket buffer size based on bandwidth limit
- Encrypted tunnel tests
- Support for multiple UDP server tunnels on one destination
- Publish medium congestion indication
- Local domain sockets for SOCKS proxy upstream
- Tunnel status "declined" in web console
- SAM error reply "Incompatible crypto" if remote destination has incompatible crypto
- Reduce amount of traffic by handling local message drops
- Keep SSU2 socket open even if it fails to bind
- Lower SSU2 resend traffic spikes
- Expiration for messages in SSU2 send queue
- Use EWMA for stream RTT estimation
- Request choking delay if too many NACKs in stream
- Allow 0ms latency for tunnel
- Randomize tunnels selection for tests
### Changed
- Upstream SOCKS proxy from SOCKS4 to SOCKS5
- Transit tunnels limit to 4 bytes. Default value to 10K
- Reply CANT_REACH_PEER if connect to ourselves in SAM
- Don't send already expired I2NP messages
- Use monotonic timer to measure tunnel test latency
- Standard NTCP2 frame doesn't exceed 16K
- Always send request through tunnels in case of restricted routes
- Don't delete connected routers from NetDb
- Send lookup reply directly to reply tunnel gateway if possible
- Reduce unreachable router ban interval to 8 minutes
- Don't request banned routers / don't try to connect to unreachable router
- Consider 'M' routers as low bandwidth
- Limit minimal received SSU2 packet size to 40 bytes
- Bob picks peer test session only if Charlie's address supports peer testing
- Reject peer test msg 2 if peer testing is not supported
- Don't request termination if SSU2 session was not established
- Set maximum SSU2 queue size depending on RTT value
- New streaming RTT calculation algorithm
- Don't double initial RTO for streams when changing tunnels
- Restore failed tunnel if test or data for inbound tunnel received
- Don't fail last remaining tunnel in pool
- Publish LeasetSet again if local destination was not ready or no tunnels
- Make more attempts to pick high bandwidth hop for client tunnel
- Reduced SSU2 session termination timeout to 165 seconds
- Reseeds list
### Fixed
- ECIESx25519 symmetric key tagset early expiration
- Encrypted LeaseSet lookup
- Outbound tunnel build fails if it's endpoint is the same as reply tunnel gateway
- I2PControl RouterManager returns invalid JSON when unknown params are passed
- Mix of data between different UDP sessions on the same server
- TARGET_OS_SIMULATOR check
- Handling of "reservedrange" param
- New NTCP2 session gets teminated upon termination of old one
- New SSU2 session gets teminated upon termination of old one
- Peer test to non-supporting router
- Streaming ackThrough off 1 if number of NACKs exceeds 255
- Race condition in ECIESx25519 tags table
- Good tunnel becomes failed
- Crash when packet comes to terminated stream
- Stream hangs during LeaseSet update

## [2.50.2] - 2024-01-06
###Fixed
- Crash with OpenSSL 3.2.0
- False positive clock skew detection

## [2.50.1] - 2023-12-23
###Fixed
- Support for new EdDSA usage behavior in OpenSSL 3.2.0

## [2.50.0] - 2023-12-18
### Added
- Support of concurrent ACCEPTs on SAM 3.1
- Haiku OS support
- Low bandwidth and far routers can expire before 1 hour
### Changed
- Don't pick too active peer for first hop
- Try peer test again if status is Unknown
- Send peer tests with random delay
- Reseeds list
### Fixed
- XSS vulnerability in addresshelper
- Publishing NAT64 ipv6 addresses
- Deadlock in AsyncSend callback

## [2.49.0] - 2023-09-18
### Added
- Handle SOCK5 authorization with empty user/password
- Drop incoming transport sessions from too old or from future routers
- Memory pool for router profiles
- Allow 0 hops in explicitPeers
### Changed
- Separate network and testing status
- Remove AVX code
- Improve NTCP2 transport session logging
- Select router with ipv4 for tunnel endpoint
- Consider all addresses non-published for U and H routers even if they have host/port
- Don't pick completely unreachable routers for tunnels
- Exclude SSU1 introducers from SSU2 addresses
- Don't create paired inbound tunnel if length is different
- Remove introducer from RouterInfo after 60 minutes
- Reduce SSU2 keep alive interval and add keep alive interval variance
- Don't pick too old sessions for introducer
### Fixed
- Version of the subnegotiation in user/password SOCKS5 response
- Send keepalive for existing session with introducer
- Buffer offset for EVP_EncryptFinal_ex() to include outlen
- Termination block size processing for transport sessions
- Crash if deleted BOB destination was shared between few BOB sessions
- Introducers with zero tag
- Padding for SSU2 path response

## [2.48.0] - 2023-06-12
### Added
- Allow user/password authentication method for SOCK5 proxy
- Publish reject all congestion cap 'G' if transit is not accepted
- 'critical' log level
- Print b32 on webconsole destination page
- Webconsole button to drop a remote LeaseSet
- limits.zombies param - minimum percentage of successfully created tunnels for routers cleanup
- Recognize real routers if successfully connected or responded to tunnel build request
### Changed
- Bypass slow transport sessions for first hop selection
- Limit AESNI inline asm to x86/x64
- Create smaller I2NP packets if possible
- Make router unreachable if AEAD tag verification fails in SessionCreated
- Don't include a router to floodfills list until it's confirmed as real
- Drop LeaseSet store request if not floodfill
- Bypass medium congestion('D') routers for client tunnels
- Publish encrypted RouterInfo through tunnels
- Check if s is valid x25519 public key
- Check if socket is open before sending data in SSU2
### Fixed
- Webconsole empty page if destination is not found
- i2p.streaming.answerPings param
- Reload tunnels
- Address caps for unspecified ipv6 address
- Incomplete HTTP headers in I2P tunnels
- SSU2 socket network exceptions on Windows
- Use of 'server' type tunnel port as inport (#1936)

## [2.47.0] - 2023-03-11
### Added
- Congestion caps
- SAM UDP port parameter
- Support domain addresses for yggdrasil reseeds
### Changed
- DHT for floodfills instead plain list
- Process router's messages in separate thread
- Don't publish non-reachable router
- Send and check target destination in first streaming SYN packet
- Reseeds list
### Fixed
- Memory leak in windows network state detection
- Reseed attempts from invalid address

## [2.46.1] - 2023-02-20
### Fixed
- Race condition while getting router's peer profile
- Creation of new router.info
- Displaying LeaseSets in the webconsole
- Crash when processing ACK request

## [2.46.0] - 2023-02-15
### Added
- Limit number of acked SSU2 packets to 511
- Localization to Swedish, Portuguese, Turkish, Polish
- Periodically send Datetime block in NTCP2 and SSU2
- Don't select random port from reserved
- In memory table for peer profiles
- Store if router was unreachable in it's peer profile
- Show IPv6 addresses in square brackets in webconsole
- Check referer when processing Addresshelper
### Changed
- Algorithm for tunnel creation success rate calculation
- Drop incoming NTCP2 and SSU2 connection if published IP doesn't match actual endpoint
- Exclude actually unreachable router from netdb for 2 hours
- Select first hop from high bandwidth peers for client tunnels
- Drop too long or too short LeaseSet
- Delete router from netdb if became invalid after update
- Terminate existing session if clock skew detected
- Close previous UDP socket if open before reopening
- Minimal version for floodfill is 0.9.51
- Sort transports by endpoints in webconsole
### Fixed
- Deadlock during processing I2NP block with Garlic in ECIES encrypted message to router
- Race condition with encrypted LeaseSets
- HTTP query detection
- Connection attempts to IPs from invalid ranges
- Publish "0.0.0.0" in RouterInfo
- Crash upon receiving PeerTest 7
- Tunnels for closed SAM session socket
- Missing NTCP2 address in RouterInfo if enabled back

## [2.45.1] - 2023-01-11
### Added
- Full Cone NAT status error
### Changed
- Drop duplicated I2NP messages in SSU2
- Set rejection code 30 if tunnel with id already exists
- Network status is always OK if peer test msg 5 received
### Fixed
- UPnP crash if SSU2 or NTCP2 is disabled
- Crash on termination for some platforms

## [2.45.0] - 2023-01-03
### Added
- Test for Symmetric NAT with peer test msgs 6 and 7
- Webconsole "No Descriptors" router error state
- 1 and 15 seconds bandwidth calculation for i2pcontrol
- Show non-zero send queue size for transports in web console
- Compressible padding for I2P addresses
- Localization to Czech
- Don't accept incoming session from invalid/reserved addresses for NTCP2 and SSU2
- Limit simultaneous tunnel build requests by 4 per pool
### Changed
- Removed SSU support
- Reduced bandwidth calculation interval from 60 to 15 seconds
- Increased default max transit tunnels number from 2500 to 5000 or 10000 for floodfill
- Transit tunnels limit is doubled if floodfill mode is enabled
- NTCP2 and SSU2 timestamps are rounded to seconds
- Drop RouterInfos and LeaseSets with timestamp from future
- Don't delete unreachable routers if tunnel creation success rate is too low
- Refuse duplicated incoming pending NTCP2 session from same IP
- Don't send SSU2 termination again if termination received block received
- Handle standard network error for SSU2 without throwing an exception
- Don't select overloaded peer for next tunnel
- Remove "X-Requested-With" in HTTP Proxy for non-AJAX requests
### Fixed
- File descriptors leak
- Random crash on AddressBook update
- Crash if incorrect LeaseSet size
- Spamming to log if no descriptors
- ::1 address in RouterInfo
- SSU2 network error handling (especially for Windows)
- Race condition with pending outgoing SSU2 sessions
- RTT self-reduction for long-live streams

## [2.44.0] - 2022-11-20
### Added
- SSL connection for server I2P tunnels
- Localization to Italian and Spanish
- SSU2 through SOCKS5 UDP proxy
- Reload tunnels through web console
- SSU2 send immediate ack request flag
- SSU2 send and verify path challenge
- Configurable ssu2.mtu4 and ssu2.mtu6
### Changed
- SSU2 is enabled and SSU is disabled by default
- Separate network status and error
- Random selection between NTCP2 and SSU2 priority
- Added notbob.i2p to jump services
- Remove DoNotTrack flag from HTTP Request header
- Skip addresshelper page if destination was not changed
- SSU2 allow different ports from RelayReponse and HolePunch
- SSU2 resend PeerTest msg 1 and msg 2
- SSU2 Send Retry instead SessionCreated if clock skew detected
### Fixed
- Long HTTP headers for HTTP proxy and HTTP server tunnel
- SSU2 resends and resend limits
- Crash at startup if addressbook is disabled
- NTCP2 ipv6 connection through SOCKS5 proxy
- SSU2 SessionRequest with zero token
- SSU2 MTU less than 1280
- SSU2 port=1
- Incorrect addresses from network interfaces
- Definitions for Darwin PPC; do not use pthread_setname_np

## [2.43.0] - 2022-08-22
### Added
- Complete SSU2 implementation
- Localization to Chinese
- Send RouterInfo update for long live sessions
- Explicit ipv6 ranges of known tunnel brokers for MTU detection
- Always send "Connection: close" and strip out Keep-Alive for server HTTP tunnel
- Show ports for all transports in web console
- Translation of webconsole site title
- Support for Windows ProgramData path when running as service
- Ability to turn off address book
- Handle signals TSTP and CONT to stop and resume network
### Changed
- Case insensitive headers for server HTTP tunnel
- Do not show 'Address registration' line if LeaseSet is encrypted
- SSU2 transports have higher priority than SSU
- Disable ElGamal precalculated table if no SSU
- Deprecate limits.ntcpsoft, limits.ntcphard and limits.ntcpthreads config options
- SSU2 is enabled and SSU is disabled by default for new installations
### Fixed
- Typo with Referer header name in HTTP proxy
- Can't handle garlic message from an exploratory tunnel
- Incorrect encryption key for exploratory lookup reply
- Bound checks issues in LeaseSets code
- MTU detection on Windows
- Crash on stop of active server tunnel
- Send datagram to wrong destination in SAM
- Incorrect static key in RouterInfo if the keys were regenerated
- Duplicated sessions in BOB

## [2.42.1] - 2022-05-24
### Fixed
- Incorrect jump link in HTTP Proxy

## [2.42.0] - 2022-05-22
### Added
- Preliminary SSU2 implementation
- Tunnel length variance
- Localization to French
- Daily cleanup of obsolete peer profiles
- Ordered jump services list in HTTP proxy
- Win32 service
- Show port for local non-published SSU addresses in web console
### Changed
- Maximum RouterInfo length increased to 3K
- Skip unknown addresses in RouterInfo
- Don't pick own router for peer test
- Reseeds list
- Internal numeric id for families
- Use ipv6 preference only when netinet headers not used
- Close stream if delete requested
- Remove version from title in web console
- Drop MESHNET build option
- Set data path before initialization
- Don't show registration block in web console if token is not provided
### Fixed
- Encrypted LeaseSet for EdDSA signature
- Clients tunnels are not built if clock is not synced on start
- Incorrect processing of i2cp.dontPublishLeaseSet param
- UDP tunnels reload
- Build for LibreSSL 3.5.2
- Race condition in short tunnel build message
- Race condition in local RouterInfo buffer allocation

## [2.41.0] - 2022-02-20
### Added
- Clock syncronization through SSU
- Drop routers older than 6 months on start
- Localization to German
- Don't send streaming ack too frequently
- Select compatible outbound tunnel for I2CP messages
- Restart webconsole's acceptor in case of exception
### Changed
- Use builtin bitswap for endian on windows
- Send SessionCreated before connection close if clock skew
- Try another floodfill for publishing if no compatible tunnels found
- Reduce memory usage for RouterInfo structures
- Avoid duplicated addresses in RouterInfo. Check presence of netId and version
- Use TCP/IP sockets for I2CP on Android instead local sockets
- Return uptime as integer in I2PControl
- Reseed servers list/cerificates
- Webconsole's dark style colors
### Fixed
- Attempt to use Yggdrasil on start on Android
- Attempts to send peer tests to itself
- Severe packets drop in SSU
- Crash on tunnel tests
- Loading addressbook subscriptions from config
- Multiple I2CP session to the same destination
- Build on Apple Silicon

## [2.40.0] - 2021-11-29
### Added
- Keep alive parameter for client tunnels
- Support openssl 3.0.0
- Localization to Armenian
- Show git commit info in version
- Windows menu item for opening datadir
- Reseed if too few floodfills
- Don't publish old and replacing tunnel in LeaseSet
- Webconsole light/dark theme depending on system settings (via CSS)
### Changed
- Set gzip compression to false by default
- Build tunnel through ECIES routers only
- Removed ElGamal support for tunnels
- Moved webconsole resources to separate file
- Pick tunnels with compatible transport with another tunnel of floodfill
- Use common cleanup timer for all SSU sessions
- Reduced memory usage
- Reseed servers list
- i18n code called from ClientContext
### Fixed
- Tunnels reload
- Some typos in log messages
- Cleanup relay requests table
- Server tunnel is not published
- Build on GNU/Hurd. Disable pthread_setname_np
- Crash when incorrect sigtype used with blinding

## [2.39.0] - 2021-08-23
### Added
- Short tunnel build messages
- Localization. To: Russian, Ukrainian, Turkmen, Uzbek and Afrikaans
- Custom CSS styles for webconsole
- Avoid slow tunnels with more than 250 ms per hop
- Process DELAY_REQUESTED streaming option
- "certsdir" options for certificates location
- Keep own RouterInfo in NetBb
- Pick ECIES routers only for tunnels on non-x64
- NTP sync through ipv6
- Allow ipv6 addresses for UDP server tunnels
### Changed
- Rekey of all routers to ECIES
- Better distribution for random tunnel's peer selection
- Yggdrasil reseed for v0.4, added two more
- Encryption type 0,4 by default for server tunnels
- Handle i2cp.dontPublishLeaseSet param for all destinations
- reg.i2p for subscriptions
- LeaseSet type 3 by default
- Don't allocate payload buffer for every single ECIESx25519 message
- Prefer public ipv6 instead rfc4941
- Optimal padding for one-time ECIESx25519 message
- Don't send datetime block for one-time ECIESx25519 message with one-time key
- Router with expired introducer is still valid
- Don't disable floodfill if still reachable by ipv6
- Set minimal version for floodfill to 0.9.38
- Eliminate extra lookups for sequential fragments on tunnel endpoint
- Consistent path for explicit peers
- Always create new tunnel from exploratory pool
- Don't try to connect to a router not reachable from us
- Mark additional ipv6 addresses/nets as reserved (#1679)
### Fixed
- Zero-hop tunnels
- Crash upon SAM session termination
- Build with boost < 1.55.0
- Address type for NTCP2 acceptors
- Check of ipv4/ipv6 address
- Request router to send to if not in NetDb
- Count outbound traffic for zero-hop tunnels
- URLdecode domain for registration string generator in webconsole

## [2.38.0] - 2021-05-17
### Added
- Publish ipv6 introducers
- Bind ipv6 or yggdrasil NTCP2 acceptor to specified address
- Support .b32.i2p addresses and hostnames for SAM STREAM CREATE
- ipv6 peer tests
- Publish iexp param for introducers
- Show ipv6 network status on the webconsole
- EdDSA signing keys can also be blinded
- Show router version on the webconsole
### Changed
- Rekey of all routers but floodfills to ECIES
- Increased number of precalculated x25519 keys to 15
- Don't publish LeaseSet without inbound tunnels
- Reseed from compatible address(ipv4 or ipv6)
- Recongnize v4 and v6 SSU addresses without host
- Inbound tunnel gateway must be ipv4 compatible
- Don't select next introducers from existing sessions
- Set X bandwidth for floodfill by default
### Fixed
- Incoming ECIES-x25519 session doesn't send updated LeaseSet
- Unique local address for server tunnels
- Race condition for LeaseSet creation in I2CP
- Relay tag for ipv6 introducer
- Already expired introducers
- Find connected router for first peer in tunnel
- Failed outgoing ECIES-x25519 session's tagset stays forever
- Yggdrasil address disappears if router becomes unreachable through ipv6
- Ignore SSU address/introducers if port is not specified
- Check identity and signature length for SSU SessionConfirmed

## [2.37.0] - 2021-03-15
### Added
- Address registration line for reg.i2p and stats.i2p through the web console
- "4" and "6" caps for addresses without published IP address
- Mesh and Proxy network statuses
- Symmetric NAT network status error
- Bind server tunnel connection to specified address
- lookuplocal BOB extended command
- address4 and address6 parameters to bind outgoing connections to
- Rekey of low-bandwidth routers to ECIES
- Popup notification windows when unable to parse config for Windows
### Changed
- Floodfills with "U" cap are not ignored anymore
- Check transports reachability between tunnel peers and between router and floodfill
- NTCP2 and reseed HTTP proxy support authorization now
- Show actual IP addresses for proxy connections
- Publish and handle SSU addreses without host
- Outbound tunnel endpoint must be ipv4 compatible
- Logging optimization
- Removed Windows service
### Fixed
- Incoming SSU session terminates after 5 seconds
- Outgoing NTCP2 ipv4 session even if ipv4 is disabled
- No incoming Yggdrasil connection if connected through NTCP2 proxy
- Race condition between tunnel build and floodfill requests decryption for ECIES routers
- Numeric bandwidth limitation
- Yggdrasil for Android

## [2.36.0] - 2021-02-15
### Added
- Encrypted lookup and publications to ECIES-x25519 floodfiils
- Yggdrasil transports and reseeds
- Dump addressbook in hosts.txt format
- Request RouterInfo through exploratory tunnels if direct connection to fllodfill is not possible
- Threads naming
- Check if public x25519 key is valid
- ECIES-X25519-AEAD-Ratchet for shared local destination
- LeaseSet creation timeout for I2CP session
- Resend RouterInfo after some interval for longer NTCP2 sessions
- Select reachable router of inbound tunnel gateway
- Reseed if no compatible routers in netdb
- Refresh on swipe in Android webconsole
### Changed
- reg.i2p for default addressbook instead inr.i2p
- ECIES-x25519 (crypto type 4) for new routers
- Try to connect to all compatible addresses from peer's RouterInfo
- Replace LeaseSet completely if store type changes
- Try ECIES-X25519-AEAD-Ratchet tag before ElGamal
- Don't detach ECIES-X25519-AEAD-Ratchet session from destination immediately
- Viewport and styles on error in HTTP proxy
- Don't create notification when Windows taskbar restarted
- Cumulative SSU ACK bitfields
- limit tunnel length to 8 hops
- Limit tunnels quantity to 16
### Fixed
- Handling chunked HTTP response in addressbook
- Missing ECIES-X25519-AEAD-Ratchet tags for multiple streams with the same destination
- Correct NAME for NAMING REPLY in SAM
- SSU crash on termination
- Offline signature length for stream close packet
- Don't send updated LeaseSet through a terminated session
- Decryption of follow-on ECIES-X25519-AEAD-Ratchet NSR messages
- Non-confirmed LeaseSet is resent too late for ECIES-X25519-AEAD-Ratchet session

## [2.35.0] - 2020-11-30
### Added
- ECIES-x25519 routers
- Random intro keys for SSU
- Graceful shutdown timer for windows
- Send queue for I2CP messages
- Update DSA router keys to EdDSA
- TCP_QUICKACK for NTCP2 sockets on Linux
### Changed
- Exclude floodfills with DSA signatures and < 0.9.28
- Random intervals between tunnel tests and manage for tunnel pools
- Don't replace an addressbook record by one with DSA signature
- Publish RouterInfo after update
- Create paired inbound tunnels if no inbound tunnels yet
- Reseed servers list
### Fixed
- Transient signature length, if different from identity
- Terminate I2CP session if destroyed
- RouterInfo publishing confirmation
- Check if ECIES-X25519-AEAD-Ratchet session expired before generating more tags
- Correct block size for delivery type local for ECIES-X25519-AEAD-Ratchet

## [2.34.0] - 2020-10-27
### Added
- Ping responses for streaming
- STREAM FORWARD for SAM
- Tunnels through ECIES-x25519 routers
- Single thread for I2CP
- Shared transient destination between proxies
- Database lookups from ECIES destinations with ratchets response
- Handle WebDAV HTTP methods
- Don't try to connect or build tunnels if offline
- Validate IP when trying connect to remote peer
- Handle ICMP responses and WinAPI errors for SSU
### Changed
- Removed NTCP
- Dropped gcc 4.7 support
- Encyption type 0,4 by default for client tunnels
- Stripped out some HTTP header for HTTP server response
- HTTP 1.1 addressbook requests
- Set LeaseSet type to 3 for ratchets if not specified
- Handle SSU v4 and v6 messages in one thread
- Eliminate DH keys thread
### Fixed
- Random crashes on I2CP session disconnect
- Stream through racthets hangs if first SYN was not acked
- Check "Last-Modified" instead "If-Modified-Since" for addressbook reponse
- Trim behind ECIESx25519 tags
- Few bugs with Android main activity
- QT visual and layout issues

## [2.33.0] - 2020-08-24
### Added
- Shared transient addresses
- crypto.ratchet.inboundTags paramater
- Multiple encryption keys through I2CP
- Pre-calculated x25519 ephemeral keys
- Change datagram routing path if nothing comes back in 10 seconds
- Shared routing path for datagram session
### Changed
- UDP tunnels send mix of repliable and raw datagrams in bulk
- Encrypt SSU packet again upon resend
- Start new tunnel message if remaining buffer is too small
- Use LeaseSet2 for ECIES-X25519-AEAD-Ratchet automatically
- Save new ECIES-X25519-AEAD-Ratchet session with NSR tagset
- Generate random padding lengths for ECIES-X25519-AEAD-Ratchet in bulk
- Webconsole layout
- Reseed servers list
### Fixed
- Don't connect through terminated SAM destination
- Differentiate UDP server sessions by port
- ECIES-X25519-AEAD-Ratchet through I2CP
- Don't save invalid address to AddressBook
- ECDSA signatures names in SAM
- AppArmor profile

## [2.32.1] - 2020-06-02
### Added
- Read explicit peers in tunnels config
### Fixed
- Generation of tags for detached sessions
- Non-updating LeaseSet1
- Start when deprecated websocket options present in i2pd.conf

## [2.32.0] - 2020-05-25
### Added
- Multiple encryption types for local destinations
- Next key and tagset for ECIES-X25519-AEAD-Ratchet
- NTCP2 through SOCKS proxy
- Throw error message if any port to bind is occupied
- gzip parameter for UDP tunnels
- Show ECIES-X25519-AEAD-Ratchet sessions and tags on the web console
- Simplified implementation of gzip for no compression mode
- Allow ECIES-X25519-AEAD-Ratchet session restart after 2 minutes
- Added logrotate config for rpm package
### Changed
- Select peers for client tunnels among routers >= 0.9.36
- Check ECIES flag for encrypted lookup reply
- Streaming MTU size 1812 for ECIES-X25519-AEAD-Ratchet
- Don't calculate checksum for Data message send through ECIES-X25519-AEAD-Ratchet
- Catch network connectivity status for Windows
- Stop as soon as no more transit tunnels during graceful shutdown for Android
- RouterInfo gzip compression level depends on size
- Send response to received datagram from ECIES-X25519-AEAD-Ratchet session
- Update webconsole functional
- Increased max transit tunnels limit
- Reseeds list
- Dropped windows support in cmake
### Fixed
- Correct timestamp check for LeaseSet2
- Encrypted leaseset without authentication
- Change SOCKS proxy connection response for clients without socks5h support (#1336)

## [2.31.0] - 2020-04-10
### Added
- NTCP2 through HTTP proxy
- Publish LeaseSet2 for I2CP destinations
- Show status page on main activity for android
- Handle ECIESFlag in DatabaseLookup at floodfill
- C++17 features for eligible compilers
### Changed
- Droped Websockets and Lua support
- Send DeliveryStatusMsg for LeaseSet for ECIES-X25519-AEAD-Ratchet
- Keep sending new session reply until established for ECIES-X25519-AEAD-Ratchet
- Updated SSU log messages
- Reopen SSU socket on exception
- Security hardening headers in web console
- Various web console changes
- Various QT changes
### Fixed
- NTCP2 socket descriptors leak
- Race condition with router's identity in transport sessions
- Not terminated streams remain forever

## [2.30.0] - 2020-02-25
### Added
- Single threaded SAM
- Experimental support of ECIES-X25519-AEAD-Ratchet crypto type
### Changed
- Minimal MTU size is 1280 for ipv6
- Use unordered_map instead map for destination's sessions and tags list
- Use std::shuffle instead std::random_shuffle
- SAM is single threaded by default
- Reseeds list
### Fixed
- Correct termination of streaming destination
- Extra ',' in RouterInfo response in I2PControl
- SAM crash on session termination
- Storage for Android 10

## [2.29.0] - 2019-10-21
### Added
- Client auth flag for b33 address
### Changed
- Remove incoming NTCP2 session from pending list when established
- Handle errors for NTCP2 SessionConfrimed send
### Fixed
- Failure to start on Windows XP
- SAM crash if invalid lookup address
- Possible crash when UPnP enabled on shutdown

## [2.28.0] - 2019-08-27
### Added
- RAW datagrams in SAM
- Publishing encrypted LeaseSet2 with DH or PSH authentication
- Ability to disable battery optimization for Android
- Transport Network ID Check
### Changed
- Set and handle published encrypted flag for LeaseSet2
### Fixed
- ReceiveID changes in the same stream
- "\r\n" command terminator in SAM
- Addressbook lines with signatures

## [2.27.0] - 2019-07-03
### Added
- Support of PSK and DH authentication for encrypted LeaseSet2
### Changed
- Uptime is based on monotonic timer
### Fixed
- BOB status command response
- Correct NTCP2 port if NTCP is disabled
- Flood encrypted LeaseSet2 with store hash

## [2.26.0] - 2019-06-07
### Added
- HTTP method "PROPFIND"
- Detection of external ipv6 address through the SSU
- NTCP2 publishing depends on network status
### Changed
- ntcp is disabled by default, ntcp2 is published by default
- Response to BOB's "list" command
- ipv6 address is not longer NTCP's local endpoint's address
- Reseeds list
- HTTP_REFERER stripping in httpproxy (#823)
### Fixed
- Check and handle incorrect BOB input
- Ignore introducers for NTCP or NTCP2 addresses
- RouterInfo check from NTCP2

## [2.25.0] - 2019-05-09
### Added
- Create, publish and handle encrypted LeaseSet2
- Support of b33 addresses
- RedDSA key blinding
- .b32.i2p addresses in jump links
- ntcp2.addressv6 parameter
### Changed
- Allow HTTP headers without value
- Set data directory from external storage path for Android
- addresshelper support is configurable per tunnel
- gradlew script for android build
### Fixed
- Deletion of expired encrypted LeaseSet2 on floodfills
- ipv6 fallback address
- SSU incoming packets routing

## [2.24.0] - 2019-03-21
### Added
- Support of transient keys for LeaseSet2
- Support of encrypted LeaseSet2
- Recognize signature type 11 (RedDSA)
- Support websocket connections over HTTP proxy
- Ability to disable full addressbook persist
### Changed
- Don't load peer profiles if non-persistant
- REUSE_ADDR for ipv6 acceptors
- Reset eTags if addressbook can't be loaded
### Fixed
- Build with boost 1.70
- Filter out unspecified addresses from RouterInfo
- Check floodfill status change
- Correct SAM response for invalid key
- SAM crash on termination for Windows
- Race condition for publishing

## [2.23.0] - 2019-01-21
### Added
- Standard LeaseSet2 support
- Ability to adjust timestamps through the NTP
- Ability to disable peer profile persist
- Request permission for android >= 6
- Initial addressbook to android assets
- Cancel graceful shutdown for android
- Russian translation for android
### Changed
- Chacha20 and Poly1305 implementation
- Eliminate extra copy of NTCP2 send buffers
- Extract content of tunnel.d from assets on android
- Removed name resolvers from transports
- Update reseed certificates
### Fixed
- LeaseSet published content verification
- Exclude invalid LeaseSets from the list on a floodfill
- Build for OpenWrt with openssl 1.1.1

## [2.22.0] - 2018-11-09
### Added
- Multiple tunnel config files from tunnels.d folder
### Changed
- Fetch own RouterInfo upon SessionRequest for NTCP2
- Faster XOR between AES blocks for non AVX capable CPUs
### Fixed
- Fixed NTCP2 termination send

## [2.21.1] - 2018-10-22
### Changed
- cost=13 for unpublished NTCP2 address
### Fixed
- Handle I2NP messages longer than 32K

## [2.21.0] - 2018-10-04
### Added
- EdDSA, x25519 and SipHash from openssl 1.1.1
- NTCP2 ipv6 incoming connections
- Show total number of destination's outgoing tags in the web console
### Changed
- Android build with openssl 1.1.1/boost 1.64
- Bandwidth classes 'P' and 'X' don't add 'O' anymore
### Fixed
- Update own RouterInfo if no SSU
- Recognize 'P' and 'X' routers as high bandwidth without 'O'
- NTCP address doesn't disappear if NTCP2 enabled
- Android with api 26+

## [2.20.0] - 2018-08-23
### Added
- Full implementation of NTCP2
- Assets for android
### Changed
- armeabi-v7a and x86 in one apk for android
- NTCP2 is enabled by default
- Show lease's expiration time in readable format in the web console
### Fixed
- Correct names for transports in the web console

## [2.19.0] - 2018-06-26
### Added
- ECIES support for RouterInfo
- HTTP outproxy authorization
- AVX/AESNI runtime detection
- Initial implementation of NTCP2
- I2CP session reconfigure
- I2CP method ClientServicesInfo
- Datagrams to websocks
### Changed
- RouterInfo uses EdDSA signature by default
- Remove stream bans
- Android build system changed to gradle
- Multiple changes in QT GUI
- Dockerfile
### Fixed
- zero tunnelID issue
- tunnels reload
- headers in webconsole
- XSS in webconsole from SAM session name
- build for gcc 8
- cmake build scripts
- systemd service files
- some netbsd issues

## [2.18.0] - 2018-01-30
### Added
- Show tunnel nicknames for I2CP destination in WebUI
- Re-create HTTP and SOCKS proxy by tunnel reload
- Graceful shutdown as soon as no more transit tunnels
### Changed
- Regenerate shared local destination by tunnel reload
- Use transient local destination by default if not specified
- Return correct code if pid file can't be created
- Timing and number of attempts for adressbook requests
- Certificates list
### Fixed
- Malformed addressbook subsctiption request
- Build with boost 1.66
- Few race conditions for SAM
- Check LeaseSet's signature before update

## [2.17.0] - 2017-12-04
### Added
- Reseed through HTTP and SOCKS proxy
- Show status of client services through web console
- Change log level through web connsole
- transient keys for tunnels
- i2p.streaming.initialAckDelay parameter
- CRYPTO_TYPE for SAM destination
- signature and crypto type for newkeys BOB command
### Changed
- Correct publication of ECIES destinations
- Disable RSA signatures completely
### Fixed
- CVE-2017-17066
- Possible buffer overflow for RSA-4096
- Shutdown from web console for Windows
- Web console page layout
## [2.16.0] - 2017-11-13
### Added
- https and "Connect" method for HTTP proxy
- outproxy for HTTP proxy
- initial support of ECIES crypto
- NTCP soft and hard descriptors limits
- Support full timestamps in logs
### Changed
- Faster implementation of GOST R 34.11 hash
- Reject routers with RSA signtures
- Reload config and shudown from Windows GUI
- Update tunnels address(destination) without restart
### Fixed
- BOB crashes if destination is not set
- Correct SAM tunnel name
- QT GUI issues

## [2.15.0] - 2017-08-17
### Added
- QT GUI
- Ability to add and remove I2P tunnels without restart
- Ability to disable SOCKS outproxy option
### Changed
- Strip-out Accept-* hedaers in HTTP proxy
- Don't run peer test if nat=false
- Separate output of NTCP and SSU sessions in Transports tab
### Fixed
- Handle lines with comments in hosts.txt file for address book
- Run router with empty netdb for testnet
- Skip expired introducers by iexp

## [2.14.0] - 2017-06-01
### Added
- Transit traffic bandwidth limitation
- NTCP connections through HTTP and SOCKS proxies
- Ability to disable address helper for HTTP proxy
### Changed
- Reseed servers list
- Minimal required version is 4.0 for Android
### Fixed
- Ignore comments in addressbook feed

## [2.13.0] - 2017-04-06
### Added
- Persist local destination's tags
- GOST signature types 9 and 10
- Exploratory tunnels configuration
### Changed
- Reseed servers list
- Inactive NTCP sockets get closed faster
- Some EdDSA speed up
### Fixed
- Multiple acceptors for SAM
- Follow on data after STREAM CREATE for SAM
- Memory leaks

## [2.12.0] - 2017-02-14
### Added
- Additional HTTP and SOCKS proxy tunnels
- Reseed from ZIP archive
- Some stats in a main window for Windows version
### Changed
- Reseed servers list
- MTU of 1488 for ipv6
- Android and Mac OS X versions use OpenSSL 1.1
- New logo for Android
### Fixed
- Multiple memory leaks
- Incomptibility of some EdDSA private keys with Java
- Clock skew for Windows XP
- Occasional crashes with I2PSnark

## [2.11.0] - 2016-12-18
### Added
- Websockets support
- Reseed through a floodfill
- Tunnel configuration for HTTP and SOCKS proxy
- Zero-hops tunnels for destinations
- Multiple acceptors for SAM
### Changed
- Reseed servers list
- DHT uses AVX if applicable
- New logo
- LeaseSet lookups
### Fixed
- HTTP Proxy connection reset for Windows
- Crash upon SAM session termination
- Can't connect to a destination for a longer time after restart
- Mass packet loss for UDP tunnels

## [2.10.2] - 2016-12-04
### Fixed
- Fixes UPnP discovery bug, producing excessive CPU usage
- Fixes sudden SSU thread stop for Windows.

## [2.10.1] - 2016-11-07
### Fixed
- Fixed some performance issues for Windows and Android

## [2.10.0] - 2016-10-17
### Added
- Datagram i2p tunnels
- Unique local addresses for server tunnels
- Configurable list of reseed servers and initial addressbook
- Configurable netid
- Initial iOS support

### Changed
- Reduced file descriptors usage
- Strict reseed checks enabled by default

## Fixed
- Multiple fixes in I2CP and BOB implementations

## [2.9.0] - 2016-08-12
### Changed
- Proxy refactoring & speedup
- Transmission-I2P support
- Graceful shutdown for Windows
- Android without QT
- Reduced number of timers in SSU
- ipv6 peer test support
- Reseed from SU3 file

## [2.8.0] - 2016-06-20
### Added
- Basic Android support
- I2CP implementation
- 'doxygen' target

### Changed
- I2PControl refactoring & fixes (proper jsonrpc responses on errors)
- boost::regex no more needed

### Fixed
- initscripts: added openrc one, in sysv-ish make I2PD_PORT optional
- properly close NTCP sessions (memleak)

## [2.7.0] - 2016-05-18
### Added
- Precomputed El-Gamal/DH tables
- Configurable limit of transit tunnels

### Changed
- Speed-up of asymmetric crypto for non-x64 platforms
- Refactoring of web-console

## [2.6.0] - 2016-03-31
### Added
- Graceful shutdown on SIGINT
- Numeric bandwidth limits (was: by router class)
- Jumpservices in web-console
- Logging to syslog
- Tray icon for windows application

### Changed
- Logs refactoring
- Improved statistics in web-console

### Deprecated:
- Renamed main/tunnels config files (will use old, if found, but emits warning)

## [2.5.1] - 2016-03-10
### Fixed
- Doesn't create ~/.i2pd dir if missing

## [2.5.0] - 2016-03-04
### Added
- IRC server tunnels
- SOCKS outproxy support
- Support for gzipped addressbook updates
- Support for router families

### Changed
- Shared RTT/RTO between streams
- Filesystem work refactoring

## [2.4.0] - 2016-02-03
### Added
- X-I2P-* headers for server http-tunnels
- I2CP options for I2P tunnels
- Show I2P tunnels in webconsole

### Changed
- Refactoring of cmdline/config parsing

## [2.3.0] - 2016-01-12
### Added
- Support for new router bandwidth class codes (P and X)
- I2PControl supports external webui
- Added --pidfile and --notransit parameters
- Ability to specify signature type for i2p tunnel

### Changed
- Fixed multiple floodfill-related bugs
- New webconsole layout

## [2.2.0] - 2015-12-22
### Added
- Ability to connect to router without ip via introducer

### Changed
- Persist temporary encryption keys for local destinations
- Performance improvements for EdDSA
- New addressbook structure

## [2.1.0] - 2015-11-12
### Added
- Implementation of EdDSA

### Changed
- EdDSA is default signature type for new RouterInfos